Trommel.



Pafented Jan. [4, 1902;

a. WADDELL.

- TB 0M M E L.

(Application filed July 15, 1901.)

(No model.)

I Q N Inventor THE NORRIS PETERS co, PMOYO-LITNCL, wAsruNm'oN. a. c.

llnTTnn STATES PATENT Utmost GEORGE F. VVADDELL, OF ANACONDA, MONTANA.

TROMMEL.

SPECIFICATION forming part of Letters Patent No. 691,025, dated January 14. 1902.

Application filed July 15, 1901. Serial No. 68,842. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE F.\VADDELL, a citizen of the United States, residing in Anaconda, Deerlodge county, Montana, (postoffice address Anaconda, Montana,) have invented certain new and useful Improvements in Trommels, of which the following isa specification.

This invention, pertaining to improvements in the construction of trommels, will be readily understood from the following description, taken in connection with the accompanying drawings, in which Figure l is a vertical longitudinal section of a trommel embodying my improvements; Fig. 2, a vertical transverse section of an exterior portion of the same upon an enlarged scale; Fig. 3, an end elevation of the headbearing, and Fig. 4 an end view of one of the screen-stares.

In the drawings, 1 indicates the shaft of the trommel; 2, the tail-bearing; 3, the headbearing; 4:, the driving-pulley; 5, spiders fast on the shaft, one near each end of the screenwork; 6, studs projecting radially from the extremities of the spider-arms and securely anchored into those arms, as by being cast or firmly screwed thereinto 7 clamp-plates disposed longitudinally of the trommel and having apertures loosely engaging the studs; 8, spool-shaped distance-pieces disposed upon the studs 6 between the pairs of clamp-plates, there being as many pairs of clamp-plates upon each pair of studs as there are screencylinders to be provided for, the inner pair of clamp-plates being at the extremities of the spider-arms and the succeeding pairs of clamp-plates being disposed in accordance with the length of the distance-pieces corre-. sponding with the desired distances between the concentric screens; 9, nuts upon the outer ends of the studs; 10, staves of screen metal with their contiguous edges engaging between the appropriate clamp-plates 7 and separated from each other a distance in excess of the diameter of the studs 6 and straddling the studs; 11, a \l-shaped hanger for the headbearing 3, the latter being securely bolted within the foot of the hanger; 12, a coverplate bolted to and tightly closing the outer end of bearing 3; 13, an annular recess within bearing 3 around the shaft near the inner end of the journal; 14, a tube communicating with recess 13 and adapted to have connection with any suitable source of water-supply under pressure; 15, an oil-hole in bearing 3 to be preferably supplied with tight cup for solid lubricant; 16, a mouth-ring secured to the head of the trommel between the end thereof and hanger 11, this ring being bolted to flanged ends of the innermost clampingbars; 17, a sheet-metal head for the trommel exterior to the mouth-ring, the same being secured in place by bolting to the flanged ends of the innermost and outermost clampplates, and 18 the nozzle or chute for supplying the trommel with material, as ore, the

same leading around and past the head-bearing and into the mouth-ring.

The staves 10, of screen metal, are to have such character of perforation as the work in hand calls for and are of course to be of such dimensions as the dimensions of the trommel call for, the staves being tapered for tapering screens. The edges of the clamp-plates 7, especially those engaging the interior surfaces of the screen-staves, are preferably bev eled, so as to be less liable to pick up and carry the stock as the trommel rotates. The structure is a very substantial and economical one and readily lends itself to the changing or replacing of screen-staves without the necessity for dismantling the entire screenwork. Thus, for instance, one of the screenstaves in the intermediate series may be replaced without disturbing any other stave. By loosening up the nuts 9 on the studs at each edge of the given stave all the clamps controlled by those studs become loosened and the given stave may be withdrawn endwise from the tromxnel and a new slave inserted, after which the nuts are to be again tightened. In this manner any stave may be readily changed or replaced without general disturbance of the structure. The drawings illustrate the trommel as provided with three series of screen-staves; but the system is applicable to any number and is particularly valuable where a plurality of screens are employed.

The peculiar form and disposition of the head-bearing and its hanger permits it to be efficient and durable while disposed within the direct range of the stream of material flowing to the trommel through the chute. For wet work a stream of water under pressure through pipe 14 produces an outward wash from the inner end of the head-bearing and prevents access of destructive material to the journal and bearing. In actual practice these machines have been used with babbitted head-bearings and have continued in good working condition until the top of the bearing-casting was cut away by the flow of stock upon it to such extent as to expose the Babbitt lining within the casting.

The drawings illustrate a trommel of such length as to be satisfactorily served by two spiders. Where lengths call for it, additional spiders may be employed, and in some cases the clamp-bars may be provided with additional clamp-bolts between the spiders.

Trommels used with heavy material are impracticable if the thin sectional perforated sheets are not reinforced by some sort of a sash at their longitudinal edges. In some cases such sash has been formed of heavy bars permanently secured to the sheets, and in other cases the edges of the sheets have been flanged. In my construction the clampplates '7 form the reinforcing sash-bars for the screen-plates when the structure is in operation; but in removing an individual stave of screen metal the reinforcing sash-bars remain in the general structure and serve for the newly-placed stave, the construction being obviously such that there is no trouble in withdrawing the staves from the clampflat clamp-plates arranged in pairs and engaging said studs, and staves of screen metal arranged in circumferential series and having flat edges engaging between the clamp-plates at the sides of and straddling said studs and adapted for longitudinal movement past said studs when the clamp-plates are loosened.

2. In a trommel, the combination, substantially as set forth, of a shaft, spiders fast thereon, studs projecting radially from the extremities of the spider-arms, longitudinal flat clamp-plates loose upon said studs, distance-pieces loose upon said studs between the separate pairs of clamp-plates thereon, and staves of screen metal having fiat edges engaging between the clamp-plates at the sides of and straddling said studs and adapted for longitudinal movement past said studs when the clamps are loosened.

3. In a trommel, the combination, substantially as set forth, of a shaft, spiders fast thereon, a circular screen of screen metal carried by the spiders, a mouth-ring carried by the trommel between the head thereof and the head-bearing of the shaft, a head-bearing supporting the head-journal of the shaft and provided with an annular recess around the shaft near the inner end of said bearing, a closure for the outer end of the head-bearing, a pipe connected with said recess and adapted to convey thereto a medium under pressure to discharge from the head-bearing into the trommel, and a lubricating-passage communicating with said head-bearing between said annular recess and said closure.

GEORGE F. VVADDELL.

Witnesses:

L. W. MENDENHALL, D. J. NEvILL. 

